Wrench



l W. C. SHEPPARD.

v WRENCH.

APPLICATION HLED JAR. I3, 1922.

Patented June 13,

ammMmlY WALTER C. SI-IEPARD, GF BALTlVOR/E, MARYLAND.

1N RENCH.

Application filed. January 13, 1922.

To all whom t may concern.'

Be it known that l, YWALTER C. SHEPPARD, a citizen ot the United States, residing at ilaltimore, in the State of Marylanth'have invented certain new and useful improve ments in lvlrenches; and l do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to maire and use the same.l

My invention relates to wrenches.

Among the objects ot my invention are:

To produce a wrench having an adjustable jaw which can be readily changed in position and locked so that it will operate practically as a solid wrench without danger of the adjustable jaw moving.

To produce wrench which is simple and capable of manufacture at a small cost.

In carrying out my invention I make use et the instrumentalities illustrated in the accompanying drawing, in which Figure 1 is a side view ot one ot my improved wrenches.

Fig. 2 is a view oi. the wrench shown in Fig. 1 looking in the direction of the arrow 2 in said ligure.

Fig. 3 is a partial section along the line B-n Fig. 2 looking in the direction of the arrows.

ln the drawings 5 represents a lever provided with a wrench jaw 6 and having a rack 7 formed upon the lever 5, the teeth oi said rack being angularly disposed with reference to the sides of said lever in order to mesh with the adjusting worm 8.

The movable jaw 9 is slidably mounted upon the lever portion 5 and is provided with bearings in which are revolubly mounted the ends of the screw 10. The screw 10 is screwed tightly into a lthreaded hole in the worm 8 and its ends serve as pintles for said worm.

A locking screw 11 is threaded in a hole in the jaw 9 and is provided with a conoidal point 12 adapted to contact with the rounded end 13 ot the screw 10 for a purpose hereinatlter explained.

The spring 14 is secured at one end to the jaw 9 by the screw 15 and its other end embraces the threaded portion of the locking screw 1 1 and has rictional contact with the underside of the head thereof.

Specification of Letters Patent.

Patented June Serial No. 529,000.

The operation ot' my improved wrench is as followsz- Y The screw 11 is to be turned until the point 12 is out of contact with the end 13. The worm 8 can then be turned in either direction in order to adjust the jaw 9 to the .proper distance from the aw G and the locking screw l1 is then to be turned until the point 12 comes in contact with the end 13.

By screwing the screw 11 in, the point 12 will torce the end 13 towards the rack 7 until the worin 8 is in iirm contact with said rack, thus not only preventing revolution of the worm 8 but taking up any lost motion between said worm and the rack which might prevent a rigid adjustment of the jaw 9 with reference to the lever 5.

lt is to be understood that the bearing for the ends ot screw 10 are su'liiciently loose to permit ot a suilicient motion of the worm 8 toward the rack 7 to eliminate lost motion between said parts.

lt 'is also to be noted that the spring 14 produces sufficient friction upon the locking screw 11 to prevent inadvertent movement ot the latter.

l/Vhile l have shown one preferred embodimentot my invention it is to be understood that l do not desire to be limited to the exact structure therein shown, for many changes may be made therein without departing from the spirit of my invention.

l claim 1. The combination with a lever, a rack and a wrench jaw fixed on said lever and a sliding j aw on saidQlever, of a worm engaging said rack and having a pintle revolub y mounted in said sliding jaw and a set screw engaging said pintle to prevent the revolution ot said worm.

2. The combination with a lever, a rack and a wrench jaw fixed on said lever and a sliding jaw on said lever, of a worm enga@- ing said rack and having a pintle revoluby mounted in a loose bearing in said sliding jaw and a set screw engaging said pintle to prevent the revolution of said worm and to press said worm against said rack.

3. The combination with a lever, a rack and a wrench jaw lined on said lever and a sliding jaw on said lever, of a worm engaging said rack and having a pintle revolubly mounted in said sliding jaw and having a rounded end, and a set screw having a comelde] peint to engage said end to prfevent the revolution of said worm und to fome it against Suid rack.

4;. The combination with u lever, e rack and a wrench jaw fixed' on said lever and a sliding jaw on said lever, of a Worm engaging said rack and having a pntle levolubly mounted in said sliding jaw, a seiJ screw engaging seid pntle t0 prevent the revolun tion of said worm and a spring engaging 10 said Set Screw to yeldng'ly hold same.

ln testimony Wlel'eo'f, l alx my signature.

WALTER C. SHEPPARD. 

